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Chapter 1 Atoms

Chapter 1 Atoms . Review. Uncharged particle in the nucleus of an atom . neutron. The number of neutrons plus protons in the nucleus of an atom. Mass number. The number of protons in the nucleus . Atomic number. Matter that is made up of only one kind of atom. element.

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Chapter 1 Atoms

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  1. Chapter 1 Atoms Review

  2. Uncharged particle in the nucleus of an atom • neutron

  3. The number of neutrons plus protons in the nucleus of an atom • Mass number

  4. The number of protons in the nucleus • Atomic number

  5. Matter that is made up of only one kind of atom • element

  6. A pure substance whose smallest unit is made of atoms of more than one element • element

  7. Region surrounding the nucleus in which the electrons move about • Electron cloud

  8. A negative charge particle that is part of every kind of matter • electron

  9. A sample of matter with the same composition and properties throughout • substance

  10. Atoms of the same element that have different number of neutrons • isotopes

  11. Elements that make up about 97% of the human body • nonmetals

  12. Elements that generally have a shiny or metallic luster • metals

  13. A positively charged particle in the nucleus • proton

  14. Two or more substances that are together, but not combined • mixture

  15. The mass of the mixture of the isotopes for an element • Atomic mass

  16. Elements that have characteristics of both metals and nonmetals • metalloids

  17. Atom, elements, atomic number, metals Fill in the blank with the words from above. • Most elements are .___. • The periodic table lists ___. • An element is made up of only one kind of __. • Isotopes can have the same ___.

  18. Metals • Elements • Atom • Atomic number

  19. Where are metalloids found on the periodic table? • Between the metals

  20. What led scientists to believe that the atom could be broken down into smaller particles • Cathode rays

  21. Elements in a ___ are always combined in the same proportion by mass • compound

  22. What did the Greeks name what they believed to be the tiniest part of matter? • atom

  23. An example of a homogenous mixture • Air • H2O

  24. Atoms of the same element always have the same number ___ • protons

  25. How is an electron cloud shaped? • sphere

  26. What is the chemical compound for ammonia? (three Hydrogen and one Nitrogen) • NH3

  27. JJ Thomson discovered that ___ charges attract each other in his cathode-ray tube experiment • opposite

  28. ___ contains only one kind of atom • Elements

  29. Isotopes are atoms of the same element that have a different number of ___ • neutrons

  30. Particles in an atom’s nucleus that do not have an electric charge are called ___? • neutrons

  31. Which is not an example of matter • Dust particle • Air • A beam of light

  32. Beam of light

  33. The mass number of an atom consists of the mass of ___. • Protons and neutrons

  34. What does the atomic number of an element tell? • Number of protons

  35. How do you find the number of neutrons in an isotope? • The atomic number from the mass number

  36. An atom of the element with atomic number of 6 always has ___ in its nucleus • Six protons

  37. Rutherfod’s experiment showed that most of an atom is made of mostly___. • space

  38. Who developed a model called the atomic theory of matter? • John Dalton

  39. Most of the elements found on the left side of the periodic table are___. • metals

  40. During Thompson’s experiments, what was affected by a magnet? • electrons

  41. Which of the following is NOT associated with metals? • Electric conductivity • Brittleness • shininess

  42. brittleness

  43. Water is an example of what kind of substance? • compound

  44. Air is an example of what kind of substance? • Homogeneous mixture

  45. What is matter that is NOT considered to be a single substance? • mixture

  46. Be able to identify all the parts of an atom and label each part • Electron • Electron cloud • Neutron • Nucleus • Proton

  47. Know the components of an element • Number of protons = number of electrons • Atomic number = number of protons • Mass number = number of protons + number of neutrons

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